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Troubleshooting A/C 700 1992

posted by  chris herbst on  Sat Mar 9 09:38 CST 2002
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last visit: Mon Oct 20 20:32 CST 2014
[RELATED]

If the ambient temp is 50 degrees or so, you should get a reading across the pressostat. It should show no appreciable resistance when there is sufficient charge, and it should show infinite when there is not.

It could be a bad pressostat as well. If you jump the wiring harness (can't remember if you did that already) and the comp runs, then it's either low charge or a bad pressostat.

The R134 conversion can mess up the pressostat because the pressure/temperature differential is way different for 134 than R12. There is far less pressure in 134 at lower temps, and far higher pressure at higher ambient temperatures. Therefore, when the 12 system would run at 40 or 50 degrees, the 134 system might not even kick in because of low pressure.

--
chris herbst, five volvos.






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